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jbhart(at)onlyinternet.ne
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 Posted: Sat Nov 28, 2009 7:54 am Post subject: Relationship Between Static, Climb Out & Cruise RPM Question |
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Kolbers,
Slowly fumbling along trying to get the MZ 34 up and running on the FireFly.
I thought I was there with cutting an old IVO propeller to 52 inches, and
replacing a defective push button bulb primer. The new primer, with a serial
shut off valve, solved all the fuel system related problems.
But after starting the engine to determine maximum static rpm, I discovered
that the battery in the Tiny Tach died, and I could not read the rpm.
Ordered a replacement. I hope to install it today so that I can measure
maximum static rpm. I do not want to remount the wings until the engine
tops out at or above 6,000 rpm. The thinking is that the engine will surely
come on up to 6,250 rpm at 60 mph cruise with the throttle wide open.
For those of you who have measured static, climb, and cruise rpm at full
throttle, is this a reasonable assumption?
Jack B. Hart FF004
Winchester, IN
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sat Nov 28, 2009 12:13 pm Post subject: Re: Relationship Between Static, Climb Out & Cruise RPM |
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Sounds good to me, I normally see the 68" Ivo on the 582 unload about 300 rpm between climbout and flat out. Currently with this cool weather I am seeing about 6350 on climbout for what it's worth.
Richard Pike
MKIII N420P (420ldPoops)
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Thom Riddle
Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)
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| Posted: Sun Nov 29, 2009 4:46 am Post subject: Re: Relationship Between Static, Climb Out & Cruise RPM |
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When pitch is set properly on slow aircraft one can expect a 5-10% difference in static and full power level flight rpm. I think anywhere in this range will probably be good enough for first flight.
As you move up the speed range (faster aircraft) the difference gets greater. When I was flying an Allegro the difference was close to 15%. Lots of GA aircraft see 20-25% difference.
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_________________
Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
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